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    Wyświetlanie 1-15 z 15
    Tytuł:
    Graphene-Based Composite Membrane for Water Desalination
    Autorzy:
    Dybowski, K.
    Kowalczyk, P.
    Kula, P.
    Jeziorna, A.
    Atraszkiewicz, R.
    Kołodziejczyk, Ł.
    Zawadzki, P.
    Nowak, D.
    Kazimierczak, T.
    Kucińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354170.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene
    desalination
    water filtration
    polycrystalline graphene
    graphene composite
    Opis:
    The article presents the results of studies on the efficacy of water desalination (i.e. Elimination of NaCl ions from the solution) using graphene-polyamide composite membranes. The membranę used for filtration consists of a monolayer of polycrystalline graphene on a porous polyamide carrier support (nylon 66). The degree of desalination for an aqueous NaCl solution percolated through the membrane was 18%. In the future this type of membrane may replace the currently used reverse osmosis membranes.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1379-1383
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of the Method of Separating Graphene from the Growth Substrate on the Quality of the 2D Material Obtained
    Autorzy:
    Dybowski, K.
    Romaniak, G.
    Kula, P.
    Jeziorna, A.
    Kowalczyk, P.
    Atraszkiewicz, R.
    Kołodziejczyk, Ł.
    Nowak, D.
    Zawadzki, P.
    Kucińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351974.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene
    polycrystalline graphene
    electrochemical delamination
    chemical etching
    graphene transfer
    Opis:
    This article presents the research results on impact of the method of polycrystalline graphene layers separation from the growth substrate on the obtained carbon material quality. The studies were carried out on graphene sheets obtained by metallurgical method on a liquid metal substrate (HSMG® graphene). The graphene was separated using chemical etching method or the electrochemical delamination method, by separating by means of electrolysis. During electrolysis, hydrogen is emitted on a graphene-covered of cathode (metal growth substrate) as a result of the voltage applied. The graphene layer breaks away from metallic substrate by gas accumulation between them. The results from these separation processes were evaluated by means of different tools, such as SEM, TEM and AFM microscopy as well as Raman Spectroscopy. In summary, the majority of analyses indicate that the graphene obtained as a result of hydrogen delamination possesses higher purity, smaller size and number of defects, its surface is smooth and less developed after the transfer process to the target substrate.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1321-1326
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Properties of Nanocomposite Nickel/Graphene Oxide Coatings Produced by Electrochemical Reduction Method
    Autorzy:
    Cieślak, G.
    Trzaska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354431.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene oxide
    nanocomposites
    electrodeposition
    nickel/graphene oxide coatings
    corrosion tests
    Opis:
    The paper presents the results of research on nanocomposite nickel/graphene oxide (Ni/GO) coatings produced by electrochemical reduction method on a steel substrate. Discussed is the method of manufacturing composite coatings with nickel matrix and embedded graphene oxide flakes. For comparative purposes, the studies also included a nanocrystalline Ni coating without embedded graphene oxide flakes. Graphene oxide was characterized by Raman spectroscopy, infrared spectroscopy (FTIR) and transmission (TEM) and scanning (SEM) electron microscopy. Results of studies on the structure of nickel and composite Ni/GO coatings deposited in a bath containing different amount of graphene oxide are presented. The coatings were characterized by scanning electron microscopy, light microscopy, Raman spectroscopy and X-ray diffraction. The adhesion of the prepared coatings to the substrate was examined by the scratch method. The microhardness of the coatings was measured using the Vickers method on perpendicular cross-sections to the surface. Corrosion tests of the coatings were investigated using the potentiodynamic method. The influence of graphene oxide on the structure and properties of composite coatings deposited from baths with different content of graphene oxide was determined.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1479-1486
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on Mechanical Properties and Microstructures of Aluminum Hybrid Composites Reinforced with Al2O3/GNPs Binary Particles
    Autorzy:
    Şenel, M. Can
    Gürbüz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049630.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite
    aluminum
    graphene
    alumina
    hybrid
    Opis:
    Nowadays, aluminum-based composites have been produced by pure alumina (Al2O3) or pure graphene nanoplatelets (GNPs) in aluminum matrix because of the high compressive strength of alumina and the solid lubricant properties of graphene. However, there are no studies on the influence of both alumina and graphene reinforced aluminum composites. In this study, Al-Al2O3 and Al-Al2O3-GNPs composites were reinforced with pure alumina (between 0 and 30 wt.%), pure graphene (0, 0.1, 0.3, 0.5 wt.%), and their hybrid forms (Al2O3-GNPs) by the powder metallurgy method. This method involved ultrasonic dispensing, mixing, filtering, drying, pressing, and sintering processes. From the test results, the micro Vickers hardness of pure aluminum (28.2±1 HV) improved to 51.5±0.8 HV (Al-30Al2O3) and 63.1±1 HV (Al-30Al2O3-0.1GNPs). Similarly, the ultimate compressive strength (UCS) enhanced from 92.4±4 MPa (pure aluminum) to 165±4.5 MPa (Al-30Al2O3) and 188±5 MPa (Al-30Al2O3-0.1GNPs), respectively. In conclusion, the Vickers hardness and ultimate compressive strength of aluminum hybrid composites improved up to 0.1 wt.% graphene content. After 0.1 wt.% graphene content, these mechanical properties decreased because of the clumping of graphene nanoparticles.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 97-106
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigating Sintering Behavior of the Graphene Nanoplatelets (GNPs) Reinforced Aluminum Nanocomposites Via Low Energy Solution Ball Milling
    Autorzy:
    Baig, Zeeshan
    Mamat, Othman
    Mustapha, Mazli
    Ali, Sadaqat
    Powiązania:
    https://bibliotekanauki.pl/articles/355724.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene
    aluminum
    milling
    dispersion
    hardness
    wear
    Opis:
    Owing to the excellent properties, graphene nanoplatelets (GNPs) show great reinforcing ability to improve the mechanical and tribological properties of Al nanocomposites for many automotive applications. In this work, the GNPs dispersion and reinforcing effect in Al nanocomposite was tested. Solvent dispersion via tip sonication and facile low energy ball milling (tumbling milling) using two milling speeds 200 and 300 rpm were employed to develop GNPs/Al powders. Sintering response of the GNPs/Al sintered samples wasgauged at two temperatures (550°C and 620°C). The effects of GNPs content, milling rotation speed and sintering temperature on the density, hardness and wear properties of the nanocomposite were examined. The results indicate that relative density % decreases with increasing GNPs content due to possible reagglomeration. The highest hardness of 35.6% and wear rate of 76.68% is achieved in 0.3 wt.% GNPs/Al nanocomposite processed at 300 rpm and 620°C as compared to pure Al due to uniform dispersion, higher diffusion rate at a higher temperature and effective lubrication effect.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 755-759
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Study of Copper Alloy with Graphene Additive via x-Ray Diffraction
    Autorzy:
    Masri, Mohamad Najmi
    Mohammad, M.
    Yusoff, Mahani
    Mamat, Sarizam
    Teo, Pao Ter
    Othman, R.
    Irfan, Abd Rahim
    Singh, Pramod K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134097.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper alloy
    graphene
    powder metallurgy
    copper
    zinc
    Opis:
    This study evaluated the effect of milling speed and compaction pressure on the densification and morphology of the CuZn-Gr composite. The composite was prepared by using the powder metallurgy technique. The effect on the microstructural and compaction was determined based on different milling speeds. The different milling speeds involved were 175, 200, 225, and 250 rpm. Meanwhile, the different compaction pressures used in this study were 127, 250, 374, and 500 MPa. The properties of the milled powder gave the result to green density and densification parameters. The XRD pattern of Cu and Zn broadened as milling time increased.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1051--1053
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Copper-Carbon Nanoforms Composites - Processing, Microstructure and Thermal Properties
    Autorzy:
    Pietrzak, K.
    Gładki, A.
    Frydman, K.
    Wójcik-Grzybek, D.
    Strojny-Nędza, A.
    Wejrzanowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/350995.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    sintering
    copper
    graphene
    thermal diffusivity
    Opis:
    The main current of publication is focused around the issues and problems associated with the formation of composite materials with Cu matrix and reinforcing phases in the various carbon nanoforms. The core of the research has been focused on thermal conductivity of these composites types. This parameter globally reflects the state of the structure, quality of raw materials and the technology used during the formation of composite materials. Vanishingly low affinity of copper for carbon, multilayered forms of graphene, the existence of critical values of graphene volume in the composite are not conducive to the classic procedures of composites designing. As a result, the expected, significant increase in thermal conductivity of composites is not greater than for pure copper matrix. Present paper especially includes: (i) data of obtaining procedure of copper/graphene mixtures, (ii) data of sintering process, (iii) the results of structure investigations and of thermal properties. Structural analysis revealed the homogenous distribution of graphene in copper matrix, the thermal analysis indicate the existence of carbon phase critical concentration, where improvement of thermal diffusivity to pure copper can occur.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1307-1310
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Graphene Oxide–Copper Composites
    Autorzy:
    Duda, P.
    Muzyka, R.
    Robak, Z.
    Kaptacz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/351676.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composites of copper
    graphene oxide
    surface microgeomety
    tribological properties
    Opis:
    Due to their characteristics, sintered Cu-C composites are materials used in electrical equipment. These characteristics include high electrical conductivity, thermal conductivity and excellent resistance to abrasion. Currently, graphite nanopowder is used successfully as a carbon material. Metal-graphite, which is created on its basis, exists in different proportions of graphite to metal. A larger graphite content has a positive effect on smaller wear of commutators and rings. In contrast, a material with a higher copper content is used at high current densities. An example of such machines is a DC motor starter characterized by low voltage and large current. Tribological properties of Cu-C composites depend on the form of carbon they include. Owing to the capability to manufacture graphene, it has become possible to produce composites with its content. The present study tested the effect of a graphene oxide content on tribological properties in contact with steel. Tests were conducted on a ball-on-disk apparatus in conditions of dry friction. Microscopic observation was performed on the Hitachi SU70 field emission electron microscope. EDS analyses were performed using the Thermo Scientific X-ray Microanalysis system. Disk wear and surface geometrical structure parameters (SGP) of the samples after tribological tests were determined on the basis of measurements made on the Talysurf 3D contact profilometer from Taylor Hobson.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 863-868
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Experimental Conditions on Deposition of Silver Nanoparticles Onto Surface of Graphene Oxide
    Wpływ warunków eksperymentalnych na proces osadzania nanocząstek srebra na powierzchni tlenku grafenu
    Autorzy:
    Wojnicki, M.
    Mania, I.
    Marzec, M.
    Gajewska, M.
    Mech, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/352579.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silver nanoparticles
    deposition
    graphene oxide
    nanocząstki srebra
    osadzanie
    tlenek grafenu
    Opis:
    Present work describes the influence of silver nanoparticles precursor form as well as the impact of graphene oxide initial concentration on deposition of the silver nanoparticles onto graphene oxide. Borane dimethylamine complex (DMAB) was used as the reducing agent. It was observed that application of silver ammonia complexes as the silver nanoparticles precursor as well as alkaline solution effect in higher quantity of deposited AgNPs in comparison to deposition process with the use of silver(I) nitrate in acidic solution.
    Praca przedstawia wyniki badań nad wpływem wybranych parametrów na proces syntezy i osadzania nanocząstek srebra na powierzchni tlenku grafenu. W badaniach uwzględniono wpływ następujących czynników: stężenie początkowe tlenku grafenu, stężenie początkowe prekursora oraz jego rodzaju. Jako reduktor jonów Ag(I) zastosowano dimetyloamino boran (DMAB). Stwierdzono, iż zastosowanie kompleksu amoniakalnego srebra jako prekursora, jak również zastosowanieśrodowiska alkaicznego skutkuje wyższą efektywnością procesu osadzania AgNPs na powierzchni tlenku grafenu w porównaniu do procesu prowadzonego z zastosowaniem azotanu(V) srebra(I) w środowisku kwaśnym.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2631-2636
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Strength Metallurgical Graphene – Mechanisms of Growth and Properties
    Grafen metalurgiczny o wysokiej wytrzymałości – mechanizmy wzrostu i właściwości
    Autorzy:
    Kula, P.
    Szymański, W.
    Kołodziejczyk, Ł.
    Atraszkiewicz, R.
    Dybowski, K.
    Grabarczyk, J.
    Pietrasik, R.
    Niedzielski, P.
    Kaczmarek, Ł.
    Cłapa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353046.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene
    growth mechanism
    electrical properties
    grafen
    mechanizm wzrostu
    właściwości elektryczne
    Opis:
    In this work, the growth mechanisms of chemical vapor deposited and metallurgical graphene and their selected mechanical and electrical properties were investigated. The study revealed the influence of the growth mechanisms on monoand poly-crystalline nanostructures of synthesized graphene monolayers. The structure of flake boundaries greatly affects both the mechanical and electrical properties. The key factors are overlapping of the graphene flakes, their degree of mismatch and the presence of π type bonds. All of these issues should be taken into account when developing industrially scaled technologies for graphene manufacturing.
    W pracy przedstawiono wyniki badań mechanizmów wzrostu oraz wybranych właściwości mechanicznych i elektrycznych grafenu chemicznie osadzanego z fazy gazowej oraz grafenu metalurgicznego. Badania wykazały wpływ mechanizmów wzrostu na mono- i polikrystaliczne nanostruktury syntetyzowanych monowarstw grafenu. Struktura granic płatków grafenu znacząco wpływa zarówno na właściwości mechaniczne jak i elektryczne. Kluczowymi czynnikami są: nakładanie się płatków grafenu, stopień ich niedopasowania oraz obecność wiązań typu π. Wszystkie te aspekty powinny być brane pod uwagę przy opracowywaniu technologii produkcji grafenu na skalę przemysłową.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2535-2542
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanocomposites graphene/CoFe2O4 and graphene/NiFe2O4 – preparation and characterization
    Autorzy:
    Jędrzejewska, A.
    Sibera, D.
    Pełech, R.
    Jedrzejewski, R.
    Narkiewicz, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/352113.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene
    nanocomposites
    CoFe2O4
    NiFe2O4
    Opis:
    A series of nanocomposite graphene/CoFe2 O4 and graphene/NiFe2 O4 hybrid materials was synthesized via facile, one-pot solvothermal route. The materials were obtained using two pressure methods: synthesis in the autoclave and synthesis in the microwave solvothermal reactor. The use of a microwave reactor enabled to significantly shorten the synthesis time up to 15 min. All the syntheses were carried out in a solution of ethanol. The effect of processing conditions and composite composition on the physicochemical properties and electric conductivity was studied. The specific surface area, density, morphology, phase composition, thermal properties and electric conductivity of the obtained composites were investigated. The results of studies of composites obtained in an autoclave and in a microwave reactor were compared.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 103-112
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Copper Powder Morphology on the Microstructure and Properties of Copper Matrix Bulk Composites Reinforced with Ni-doped Graphene
    Autorzy:
    Liu, Jituo
    Wang, Xianhui
    Liu, Jia
    Li, Hangyu
    Liang, Yan
    Ren, Jingyi
    Powiązania:
    https://bibliotekanauki.pl/articles/2048818.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ni-doped graphene
    copper base composite
    copper powder morphology
    mechanical properties
    Opis:
    To clarify the effect of copper powder morphology on the microstructure and properties of copper matrix bulk composites reinforced with Ni-doped graphene, spherical and dendritic copper powders were selected to fabricate the Ni-doped graphene reinforced copper matrix bulk composites. The Ni-doped graphene were synthesized by hydrothermal reduction method, followed by mixing with copper powders, and then consolidated by spark plasma sintering. It is found that the Ni-doped graphene are well bonded with the dendritic copper powder, whereas Ni-doped graphene are relatively independent on the spherical copper powder. The copper base bulk composite prepared by the dendritic copper powder has better properties than that prepared by spherical copper powder. At 0.5wt.% Ni-doped graphene, the dendritic copper base bulk composite has a good combination of hardness, electrical conductivity and yield strength, which are 81.62 HV, 87.93% IACS and 164 MPa, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 341-348
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Cold Drawing of Copper Covetic Nanostructured Carbon Composites
    Otrzymywanie oraz ciągnienia kompozytów miedzianych typu Covetic o strukturze nanometrycznej
    Autorzy:
    Knych, T.
    Kiesiewicz, G.
    Kwaśniewski, P.
    Mamala, A.
    Kawecki, A.
    Smyrak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/350882.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Covetic
    copper
    carbon
    graphene
    Cu-C composites
    miedź
    węgiel
    grafen
    stop Cu-C
    Opis:
    This paper presents the research results of copper Covetic metallurgical synthesis along with the characterization of cast material and the processing of casts into wires. The Cu-C composite production method was based on patent applications of Third Millennium Metals. Obtained materials were tested for their chemical composition (including Secondary Ion Mass Spectrometry (SIMS) analysis for carbon presence), mechanical properties and electrical conductivity. Measurements were also performed for wires which were first cut from obtained casts and next cold drawn into final wire form. Produced wires were tested for their mechanical and electrical properties. Electrical conductivity of wires was measured with the use of high precision Thompson’s- Kelvin’s bridge type device. A key objective of the research was to determine if Covetic copper has higher electrical conductivity than pure oxygen free copper.
    W ramach artykułu przedstawione zostały wyniki badań metalurgicznej syntezy miedzianego stopu typu Covetic, analizy uzyskanych odlewów oraz badań drutów uzyskanych w procesie ciaągnienia. Metoda syntezy stopu Cu-C oparta została na patencie firmy Third Millennium Metals. Uzyskane odlewy przebadane zostały pod kątem ich składu chemicznego (wraz z analizą obecności węgla metodą SIMS), podstawowych własności materiałowych oraz przewodności elektrycznej. Ponadto badaniom własności wytrzymałościowych i elektrycznych poddane zostały druty, które otrzymane zostały poprzez ciągnienie z uzyskanych odlewów. Przewodność elektryczna drutów mierzona była na z wykorzystaniem mostka Thompsona - Kelvina. Celem przeprowadzonych badań było ustalenie czy miedziany kompozyt typu Covetic posiada, w formie odlewów bądz drutów, wyższa niż czysta miedź przewodność elektryczna.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 4; 1283-1286
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research and Characterization of Cu – Graphene, Cu-CNT’s Composites Obtained by Mechanical Synthesis
    Badania i charakteryzacja kompozytów Cu – grafen, Cu-CNT’s uzyskiwanych metodą syntezy mechanicznej
    Autorzy:
    Kwaśniewski, P.
    Kiesiewicz, G.
    Knych, T.
    Mamala, A.
    Gniełczyk, M.
    Kawecki, A.
    Smyrak, B.
    Ściężor, W.
    Smaga-Sieja, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/354690.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene
    nanotubes
    copper
    mechanical synthesis of composites
    grafen
    nanorurki
    miedź
    mechaniczna synteza kompozytów
    Opis:
    Currently we can observe a worldwide trend to find new materials with extraordinary properties. In particular these researches are aimed to find a method to improve electrical conductivity, mechanical properties, corrosion resistance and rheological behavior of known materials. This effect can be achieved by a synthesis of modern carbon materials with metals. In this paper authors presented research results of synthesis process for Cu-graphene and Cu-CNT’s composites obtained by the mechanical synthesis in cold drawing process. The article presents also the results of electrical conductivity measurements and structural analysis of carbon particles presence in copper matrix. The research has shown that obtained composites have electrical conductivity lower than used copper base material. Additionally, the structural analysis has shown that after the drawing process carbon materials particles are mechanically pressed into Cu in the matrix, and these particles do not participate in the current flow, creating an actual barrier for electrons transport.
    Aktualnie na świecie poszukuje się nowych materiałów o własnościach dotychczas nieosiągalnych. Poszukiwania te głównie ukierunkowane są na podwyższenie przewodności elektrycznej, własności wytrzymałościowych, odporności korozyjnej, reologicznej itd. Efekt ten może być osiągnięty przez łączenie nowoczesnych nanomateriałów węglowych z metalami. W artykule przedstawiono wyniki badań syntezy miedzi z grafenem i nanorurkami metodą syntezy mechanicznej w procesie ciągnienia uzyskanych materiałów gradientowych Cu-grafen oraz Cu-CNT’s. W artykule zamieszczone zostały wyniki badań przewodności elektrycznej właściwej oraz wyniki analiz strukturalnych obecności cząstek materiałów węglowych w osnowie miedzianej. Przeprowadzone badania wykazały, że uzyskane kompozyty posiadają obniżoną przewodność elektryczną w stosunku do osnowy miedzianej. Ponadto badania strukturalne wykazały, że w osnowie po procesie ciągnienia występują wprasowane w Cu cząstki materiałów węglowych, które nie biorą udziału w przewodzeniu prądu stanowiąc barierę w transporcie elektronów.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3A; 1929-1933
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comparative Study on Ballistic Behaviour of MWCNT / Graphene Reinforced AL6061 Surface Composites Fabricated Via Friction Stir Processing
    Autorzy:
    Magarajan, U.
    Suresh Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/27324483.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    ballistic behaviour
    friction stir processing
    graphene
    Multi Walled Carbon Nano Tubes
    depth of penetration
    Opis:
    In this work, a comparative study on the ballistic behaviour of friction stir processed AL6061 targets had been made. Base Metal AL6061 (BM) plates with 25 mm thickness were friction stir processed by adding Multi Walled Carbon Nano Tubes (MWCNT) and Graphene (G), producing AL6061-MWCNT and AL6061-G surface composites. Optical microscopy and microhardness test on BM, AL6061-MWCNT and AL6061-G samples were performed as per the standard procedure. It was noticed that uniform dispersion of ceramic particles and refined grains were obtained for the friction stir processed surface composites. From the microhardness test, it was perceived that friction stir processing had induced strengthening of surface composites, hence increasing the microhardness of AL6061-MWCNT and AL6061-G by ~60.3% and ~73.6% respectively. Also, ballistic experiments were conducted at 680±10 m/s by impacting Ø7.62×51 mm projectiles. AL6063 backing plates were placed to compare the ballistic behaviours AL6061-MWCNT and AL6061-G targets by depth of penetration. It was noted that the depth of penetration of AL6061-MWCNT and AL6061-G targets were 37.81% and 65.84% lesser than the BM target. Further, from the results of Post ballistic microscopy it was observed that the microstructure near and away from the penetration channel edge looks unchanged in BM target. However, the AL6061-MWCNT and AL6061-G targets showed considerable change in their morphology, by forming Adiabatic Shear Bands.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 541--550
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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